43820146664429 has 2 divisors, whose sum is σ = 43820146664430. Its totient is φ = 43820146664428.

The previous prime is 43820146664353. The next prime is 43820146664501. The reversal of 43820146664429 is 92446664102834.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21941823324100 + 21878323340329 = 4684210^2 + 4677427^2 .

It is a cyclic number.

It is not a de Polignac number, because 43820146664429 - 2¹² = 43820146660333 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43820146661429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21910073332214 + 21910073332215.

It is an arithmetic number, because the mean of its divisors is an integer number (21910073332215).

Almost surely, 2^{43820146664429} is an apocalyptic number.

It is an amenable number.

43820146664429 is a deficient number, since it is larger than the sum of its proper divisors (1).

43820146664429 is an equidigital number, since it uses as much as digits as its factorization.

43820146664429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47775744, while the sum is 59.

The spelling of 43820146664429 in words is "forty-three trillion, eight hundred twenty billion, one hundred forty-six million, six hundred sixty-four thousand, four hundred twenty-nine".